Display panel, display device and preparation method of display panel

Abstract

The invention provides a display panel, a display device and a preparation method of the display panel. The display panel comprises a substrate, a first electrode layer, a pixel defining layer, a functional layer, a light-emitting layer and a second electrode layer. By setting the evaporation angle of the evaporation source, the side, close to the evaporation source, of the first groove section is shielded, the functional layer is disconnected at the first groove section, the forming process of the second electrode layer is adjusted, it is guaranteed that the second electrode layer is continuous at the first groove section, and the partition structure is arranged at the second groove section; the functional layer and the second electrode layer are cut off by the partition structure at the second groove section, complete partition of the functional layer around the light-emitting layer is achieved, meanwhile, the second electrode layer is continuous on the two sides of the light-emitting layer in the first direction, functional layer partition between the adjacent light-emitting layers can be achieved, whole-face continuity and electric conduction of the second electrode layer can be guaranteed, and the light-emitting efficiency is improved. Therefore, the crosstalk problem caused by transverse electric leakage of the functional layer is improved, the color cast and the color gamut are improved, and the display effect of the display panel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display panels, and in particular to a display panel, a display device, and a method for manufacturing a display panel. Background Art

[0002] Small and medium-sized AMOLEDs (Active-matrix organic light-emitting diodes) are typically manufactured using an evaporation process. To reduce cost and process complexity, some functional layers, such as the HIL and HTL, are vapor-deposited across the entire surface using a common mask. This is known as the common layer. In tandem OLED devices, the carrier generation layer (CGL) is also typically manufactured using a common mask, a highly conductive common layer. When a subpixel, such as a green pixel, is driven to emit light, the high conductivity of the common layer causes a small amount of charge carriers to flow through it to adjacent subpixels, causing them to emit light. This can lead to color shift (i.e., pixel crosstalk or color unevenness caused by lateral leakage), reducing the product's color gamut. Summary of the Invention

[0003] Therefore, it is necessary to provide a display panel, a display device and a method for manufacturing a display panel to address the above problems.

[0004] The technical solution is as follows:

[0005] In a first aspect, a display panel is provided, comprising:

[0006] substrate;

[0007] a first electrode layer, disposed on one side of the substrate;

[0008] a pixel defining layer, disposed on a side of the first electrode layer away from the substrate and defining a plurality of pixel openings, wherein a plurality of isolation trenches are provided on the side of the pixel defining layer away from the substrate, and the isolation trenches are disposed around the periphery of the pixel openings;

[0009] a functional layer, disposed on the pixel definition layer and the first electrode layer;

[0010] a light-emitting layer, located in the pixel opening and disposed on a side of the functional layer away from the substrate;

[0011] a second electrode layer, disposed on a side of the functional layer and the light-emitting layer away from the substrate;

[0012] In which, the isolation groove includes a first groove section arranged opposite to each other along a first direction and a second groove section arranged opposite to each other along a second direction, the inclination angle of the inner side wall of the first groove section is set to a first inclination angle, and the inclination angle of the inner side wall of the pixel opening is a second inclination angle, the first inclination angle is greater than the evaporation angle of the evaporation source, and the second inclination angle is less than the evaporation angle of the evaporation source, so that the functional layer is disconnected at the first groove section; the second electrode layer is continuous at the first groove section; a partition structure for separating the functional layer and the second electrode layer is provided on the end face and / or inner wall of the second groove section; the second direction is set at an angle to the first direction.

[0013] The technical solution is further described below:

[0014] In one embodiment, the functional layer is disconnected at the first slot segment and the second slot segment, and the second electrode layer is continuous at the first slot segment and disconnected at the second slot segment.

[0015] In one embodiment, the partition structure includes eaves, and each second trough section is provided with two eaves spaced apart along the width direction of the second trough section, the two eaves are arranged on the end face of the second trough section on the sides away from each other, and the two eaves are extended from both sides of the second trough section to the top of the second trough section on the sides close to each other, so as to disconnect the functional layer when the functional layer is evaporated at the second trough section, and disconnect the second electrode layer when the second electrode layer is evaporated at the second trough section.

[0016] In one embodiment, the partition structure includes a partition groove, which is arranged on the inner wall of the second groove section to disconnect the functional layer when the functional layer is evaporated at the second groove section, and to disconnect the second electrode layer when the second electrode layer is evaporated at the second groove section.

[0017] In one embodiment, the first inclination angle is set to 60° to 75°; the second inclination angle is set to 30° to 45°.

[0018] In a second aspect, a display device is provided, comprising the display panel.

[0019] In a third aspect, a method for preparing a display panel is provided, the method comprising:

[0020] forming a first electrode layer and a pixel defining layer in sequence on one side of the substrate;

[0021] An isolation trench is formed on a side of the pixel defining layer away from the substrate; wherein the isolation trench includes a first trench section and a second trench section;

[0022] forming a partition structure at the second groove section;

[0023] forming a functional layer on the pixel defining layer and the first electrode layer by evaporation, wherein when the functional layer is evaporated at the first groove section, the evaporation angle of the evaporation source is smaller than the first inclination angle and larger than the second inclination angle, so that the functional layer is disconnected at the first groove section; and when the functional layer is evaporated at the second groove section, the functional layer is disconnected at the second groove section under the action of the partition structure;

[0024] forming a light-emitting layer on the functional layer within the pixel opening of the pixel defining layer;

[0025] forming a second electrode layer on the functional layer and the light-emitting layer, wherein when the second electrode layer is formed at the first groove section, the second electrode layer is continuous at the first groove section, and when the second electrode layer is formed at the second groove section, the second electrode layer is disconnected at the second groove section due to the action of the partition structure;

[0026] The first inclination angle is the inclination angle of the inner side wall of the first groove segment, and the second inclination angle is the inclination angle of the inner side wall of the pixel opening.

[0027] In one embodiment, the step of forming a partition structure at the second groove section includes:

[0028] forming a mask layer on the pixel defining layer and the first electrode layer;

[0029] Etching away the mask layer in the pixel opening, the mask layer in the first groove segment, the mask layer at the end surface of the first groove segment, and the mask layer in the second groove segment, and retaining the mask layer at the end surface of the second groove segment to form an eaves;

[0030] Carving a side on the inner wall of the second groove section so that the eaves can disconnect the functional layer when the functional layer is evaporated at the second groove section, and disconnect the second electrode layer when the second electrode layer is evaporated at the second groove section;

[0031] The depth of the side engraving on the inner wall of the second groove segment is 0.2 μm to 0.8 μm.

[0032] In one embodiment, the step of forming a partition structure at the second groove section includes:

[0033] forming a mask layer on the pixel defining layer and the first electrode layer;

[0034] etching away the mask layer in the second groove segment, and further etching the inner wall of the second groove segment to form a partition groove on the inner wall of the second groove segment;

[0035] etching away all of the mask layer on the pixel definition layer and the first electrode layer;

[0036] Wherein, the thickness of the mask layer is 300 angstroms to 1000 angstroms.

[0037] In one embodiment, when forming the second electrode layer at the first slot segment, the second electrode layer at the first slot segment comprises:

[0038] When forming the second electrode layer at the first groove section, the evaporation angle of the cathode source is 20° to 30°, and the substrate is controlled to rotate so that the second electrode layer is continuous at the first groove section.

[0039] Compared with the display panels in the prior art, the display panel, display device and display panel preparation method in the present application have at least the following advantages: through the isolation groove on the periphery of the light-emitting layer and the evaporation angle design when evaporating the functional layer, that is, the evaporation angle of the evaporation source is set between the first inclination angle and the second inclination angle, so that the side of the first groove section close to the evaporation source is blocked, and the functional layer is disconnected at the first groove section, and the formation process of the second electrode layer is adjusted to ensure that the second electrode layer is continuous at the first groove section. At the same time, a partition structure is set at the second groove section, so that the functional layer and the second electrode layer are both disconnected by the partition structure at the second groove section, thereby achieving complete isolation of the functional layer around the light-emitting layer. At the same time, the second electrode layer is continuous on both sides of the light-emitting layer along the first direction, and the second electrode layer is disconnected on both sides of the light-emitting layer along the second direction. In this way, the functional layer isolation between adjacent light-emitting layers can be achieved, and the entire surface of the second electrode layer can be ensured to be continuous and electrically conductive, thereby improving the crosstalk problem caused by lateral leakage of the functional layer, improving color deviation and color gamut, and thus improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1is a cross-sectional view of a display panel in the prior art.

[0043] Figure 2 FIG. 1 is a schematic diagram of a partial structure of a display panel according to an embodiment.

[0044] Figure 3 for Figure 2 A partial cross-sectional view of a display panel along a first direction.

[0045] Figure 4 for Figure 2 A partial cross-sectional view of a display panel along the second direction.

[0046] Figure 5 FIG. 1 is a partial cross-sectional view of a display panel along the second direction according to another embodiment.

[0047] Figure 6 Schematic diagram of the structure of the evaporation source when evaporating the functional layer at the first groove section in one embodiment.

[0048] Figure 7 Schematic diagram of the structure of the cathode source when evaporating the second electrode layer at the first slot section in one embodiment.

[0049] Figure 8 The present invention is a flow chart of a method for manufacturing a display panel according to an embodiment.

[0050] Figure 9 FIG. 4 is a partial process flow chart of a display panel in one embodiment.

[0051] Figure 10 FIG. 4 is a partial process flow chart of a display panel in another embodiment.

[0052] Description of reference numerals:

[0053] 10. Display panel; 100. Substrate; 200. First electrode layer; 300. Pixel defining layer; 310. Pixel opening; 320. Isolation groove; 321. First groove section; 322. Second groove section; 400. Functional layer; 500. Light-emitting layer; 600. Second electrode layer; 700. Partition structure; 710. Eaves; 720. Partition groove; 20. Evaporation source; 30. Cathode source; 40. Mask layer. DETAILED DESCRIPTION

[0054] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0055] like Figure 1 、 Figure 2 and Figure 3 As shown, in one embodiment, a display panel 10 is provided, comprising a substrate 100, a first electrode layer 200, a pixel defining layer 300, a functional layer 400, a light-emitting layer 500, and a second electrode layer 600. The first electrode layer 200 is disposed on one side of the substrate 100. The pixel defining layer 300 is disposed on a side of the first electrode layer 200 away from the substrate 100 and defines a plurality of pixel openings 310. A plurality of isolation trenches 320 are provided on a side of the pixel defining layer 300 away from the substrate 100. The isolation trenches 320 are disposed around the periphery of the pixel openings 310. The functional layer 400 is disposed on the pixel defining layer 300 and the first electrode layer 200. The light-emitting layer 500 is located within the pixel openings 310 and is disposed on a side of the functional layer 400 away from the substrate 100. The second electrode layer 600 is disposed on a side of the functional layer 400 and the light-emitting layer 500 away from the substrate 100.

[0056] The isolation trench 320 includes a first trench section 321 disposed opposite to each other along a first direction and a second trench section 322 disposed opposite to each other along a second direction. The inner sidewall of the first trench section 321 is tilted at a first angle. The inner sidewall of the pixel opening 310 is tilted at a second angle. The first angle is greater than the evaporation angle of the evaporation source 20, and the second angle is less than the evaporation angle of the evaporation source 20, so that the functional layer 400 is disconnected at the first trench section 321. The second electrode layer 600 is continuous at the first trench section 321. A partition structure 700 is provided on the end surface and / or inner wall of the second trench section 322 for separating the functional layer 400 and the second electrode layer 600. The second direction is arranged at an angle to the first direction.

[0057] During the fabrication of the display panel 10 in the above-described embodiment, a first electrode layer 200 and a pixel definition layer 300 are first formed sequentially on one side of the substrate 100. Next, a pixel opening 310 and an isolation trench 320 are formed on the side of the pixel definition layer 300 away from the substrate 100. The isolation trench 320 includes a first trench section 321 and a second trench section 322 of different structures. A partition structure 700 is then formed at the second trench section 322. Next, a functional layer 400 is formed on the pixel definition layer 300 and the first electrode layer 200 by vapor deposition. When the functional layer 400 is vapor-deposited at the first trench section 321, the vapor deposition angle of the evaporation source 20 is less than the first tilt angle and greater than the second tilt angle, so that the functional layer 400 is disconnected at the first trench section 321. When the functional layer 400 is vapor-deposited at the second trench section 322, the functional layer 400 is disconnected at the second trench section 322 due to the action of the partition structure 700. Next, a light-emitting layer 500 is formed on the functional layer 400 within the pixel opening 310. Finally, a second electrode layer 600 is formed on the functional layer 400 and the light-emitting layer 500. When the second electrode layer 600 is formed at the first groove section 321, the second electrode layer 600 is continuous at the first groove section 321. When the second electrode layer 600 is formed at the second groove section 322, the second electrode layer 600 is disconnected at the second groove section 322 due to the function of the partition structure 700. Compared with the display panel in the prior art, the present application adopts the isolation groove 320 on the periphery of the light-emitting layer 500 and the evaporation angle design when evaporating the functional layer 400, that is, the evaporation angle of the evaporation source 20 is set between the first tilt angle and the second tilt angle, so that the side of the first groove section 321 close to the evaporation source 20 is blocked, the functional layer 400 is disconnected at the first groove section 321, the formation process of the second electrode layer 600 is adjusted to ensure that the second electrode layer 600 is continuous at the first groove section 321, and a partition structure 700 is provided at the second groove section 322, so that the functional layer 400 and the second electrode layer 600 are connected. The electrode layer 600 is disconnected by the partition structure 700 at the second groove section 322, thereby completely isolating the functional layer 400 around the light-emitting layer 500. At the same time, the second electrode layer 600 is continuous on both sides of the light-emitting layer 500 along the first direction, and the second electrode layer 600 is disconnected on both sides of the light-emitting layer 500 along the second direction. In this way, the functional layer 400 between adjacent light-emitting layers 500 can be isolated, and the entire surface of the second electrode layer 600 can be ensured to be continuous and electrically conductive, thereby improving the crosstalk problem caused by lateral leakage of the functional layer 400, improving color deviation and color gamut, and thus improving the display effect of the display panel 10.

[0058] Specifically in this embodiment, the functional layer 400 is disconnected at the first slot section 321 and the second slot section 322 , and the second electrode layer 600 is continuous at the first slot section 321 and disconnected at the second slot section 322 .

[0059] Specifically, in this embodiment, each pixel opening 310 is spaced apart and extends to the position where the pixel defining layer 300 and the first electrode layer 200 are in contact. Each isolation trench 320 is correspondingly disposed around the periphery of each pixel opening 310. The first electrode layer 200 is configured as an anode layer, and the second electrode layer 600 is configured as a cathode layer.

[0060] It should be noted that substrate 100 refers to the underlying structure used to support and carry other functional layers, such as the electrode layer, light-emitting layer 500, and pixel-defining layer 300. Substrate 100 plays a crucial role in the performance, durability, and production process of the display, providing structural support, electrical connections, protection, and thermal management.

[0061] It should be noted that the first electrode layer 200 refers to the portion of the electrode structure responsible for conducting current and interacting with other materials (such as the functional layer 400). The first electrode layer 200 plays a crucial role in various types of displays (such as OLEDs and LCDs), providing functions and effects such as current conduction, light emission, display generation, and optical characteristics.

[0062] The number, shape, and arrangement of the pixel openings 310 can be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, the number of pixel openings 310 is three, and the number of isolation grooves 320 is the same as the number of pixel openings 310. Each isolation groove 320 is provided corresponding to each pixel opening 310. The light-emitting layer 500 includes at least three sub-pixels, each of which is located within a corresponding pixel opening 310 and is mounted on the functional layer 400. Specifically, three sub-pixels form a group and are arranged in a delta arrangement.

[0063] It should be noted that the pixel defining layer 300 is a critical component of the display panel 10, particularly in technologies such as liquid crystal displays (LCDs) and organic light-emitting diodes (OLEDs). The pixel defining layer 300 primarily defines the boundaries of each sub-pixel, ensuring that each sub-pixel can operate effectively and independently, thereby creating a clear and precise image. Specifically, in this embodiment, the pixel defining layer 300 can be configured as a common layer or carrier generation layer as is conventionally practiced.

[0064] It should be noted that the functional layer 400 is a layer composed of organic materials and is widely used in organic light-emitting diodes (OLEDs) and organic optoelectronic devices (such as organic solar cells and organic photodiodes). Functional layer 400 plays a key role in the entire device, including light emission, electrical conductivity, and charge transport.

[0065] It should be noted that the light-emitting layer 500 is a key component of the display panel 10, responsible for converting electrical energy into light energy, thereby generating visible images or optical signals. The light-emitting layer 500 plays an important role in organic light-emitting diodes (OLEDs), organic photovoltaic cells, and other related technologies.

[0066] It should be noted that the second electrode layer 600 is an important component of the display panel 10 , and is mainly used to provide current and interact with other layers (such as the functional layer 400 or the light-emitting layer 500 ).

[0067] The angle between the second direction and the first direction can be flexibly adjusted according to the actual use needs. Specifically in this embodiment, the second direction is set perpendicular to the first direction. The second direction can be set as the Scan direction of the evaporation source 20 (such as Figure 2 The second direction can be set to the Nozzle direction of the evaporation source 20 (eg Figure 2 Each isolation trench 320 has two first trench sections 321 and two second trench sections 322. The two first trench sections 321 are symmetrically arranged on either side of the pixel opening 310 along the first direction; the two second trench sections 322 are symmetrically arranged on either side of the pixel opening 310 along the second direction. A first trench section 321, a second trench section 322, another first trench section 321, and another second trench section 322 are sequentially connected end to end to form a ring structure.

[0068] The partition structure 700 may be configured as any structure in the prior art that can disconnect both the functional layer 400 and the second electrode layer 600 at the second groove section 322 .

[0069] like Figure 4 As shown, the partition structure 700 optionally includes eaves 710. Two eaves 710 are provided at each second trough section 322, spaced apart along the width direction of the second trough section 322. The two eaves 710 are disposed on the end surface of the second trough section 322, with their mutually distal sides extending from both sides of the second trough section 322 to above the second trough section 322. This serves to disconnect the functional layer 400 when the functional layer 400 is evaporated at the second trough section 322, and to disconnect the second electrode layer 600 when the second electrode layer 600 is evaporated at the second trough section 322. In this way, a evaporation blind zone can be formed at the connection between the eaves 710 and the inner wall of the second trough section 322, and the organic material and the cathode material cannot reach the evaporation blind zone after evaporation, so that the functional layer 400 and the second electrode layer 600 cannot be formed on the side of the eaves 710 facing the second trough section 322 and the inner side wall of the notch of the first trough section 321, thereby achieving the effect of the functional layer 400 and the second electrode layer 600 being disconnected at the second trough section 322.

[0070] like Figure 5 As shown, the partition structure 700 optionally includes a partition groove 720. The partition groove 720 is provided on the inner wall of the second trough section 322 to disconnect the functional layer 400 when the functional layer 400 is evaporated at the second trough section 322, and to disconnect the second electrode layer 600 when the second electrode layer 600 is evaporated at the second trough section 322. In this way, a deposition blind zone can be formed at the partition groove 720. After evaporation, the organic material and the cathode material cannot reach the deposition blind zone, and thus the functional layer 400 and the second electrode layer 600 cannot be formed in the deposition blind zone. The functional layer 400 and the second electrode layer 600 in the second trough section 322 are both discontinuous at the partition groove 720, thereby achieving the effect of disconnecting the functional layer 400 and the second electrode layer 600 at the second trough section 322.

[0071] It should be noted that the partition groove 720 and the second groove segment 322 can be formed by processing in the same etching process, that is, the partition groove 720 and the second groove segment 322 are continuously etched, or they can be formed by processing in different etching processes, that is, the second groove segment 322 is first processed, and then the partition groove 720 is further processed on the inner wall of the second groove segment 322.

[0072] Specifically in this embodiment, the partition groove 720 can be arranged on the inner wall of the second groove section 322 so that the groove opening of the second groove section 322 forms a raised structure on both sides along the width direction. The function of the raised structure is the same as that of the eaves 710, and will not be described in detail here.

[0073] Specifically in this embodiment, the partition groove 720 can also be arranged on the bottom wall of the second groove section 322 to extend the depth of the second groove section 322, so that the organic material and the cathode material cannot reach the bottom wall of the partition groove 720 after evaporation, and thus the functional layer 400 and the second electrode layer 600 cannot be formed at the bottom wall of the partition groove 720. The functional layer 400 and the second electrode layer 600 in the second groove section 322 are discontinuous at the partition groove 720, thereby achieving the effect that the functional layer 400 and the second electrode layer 600 are both disconnected at the second groove section 322.

[0074] In other embodiments, the partition structure 700 includes eaves 710 and partition grooves 720. Each second trough section 322 is provided with two eaves 710 spaced apart along the width of the second trough section 322. The two eaves 710 are disposed on the end surface of the second trough section 322, with their respective ends extending from both sides of the second trough section 322 to the top of the second trough section 322. This serves to disconnect the functional layer 400 during vapor deposition of the functional layer 400 in the second trough section 322, and to disconnect the second electrode layer 600 during vapor deposition of the second electrode layer 600 in the second trough section 322. The partition grooves 720 are disposed on the inner wall of the second trough section 322, serving to disconnect the functional layer 400 during vapor deposition of the functional layer 400 in the second trough section 322, and to disconnect the second electrode layer 600 during vapor deposition of the second electrode layer 600 in the second trough section 322. In this way, the eaves 710 and the partition groove 720 can both disconnect the functional layer 400 and the second electrode layer 600, ensuring that the functional layer 400 and the second electrode layer 600 are discontinuous at the second groove section 322, thereby improving the reliability of the display panel 10.

[0075] It should be noted that both ends of each eave 710 extend to both ends of the second slot section 322 . Both ends of each partition slot 720 extend to both ends of the second slot section 322 .

[0076] Among them, the first tilt angle (such as Figure 3 The value of the second tilt angle (as shown in β) Figure 3 The angle shown in γ) and the evaporation angle of the evaporation source 20 (as shown in Figure 6 The value of β>α>γ can be flexibly adjusted according to the actual needs, as long as β>α>γ is satisfied. When the functional layer 400 is evaporated at the first groove section 321, the functional layer 400 is disconnected at the first groove section 321. When the second electrode layer 600 is evaporated at the first groove section 321, the second electrode layer 600 is continuous at the first groove section 321.

[0077] It should be noted that in the evaporation process, the evaporation source 20 refers to the organic material or compound used to form the thin film. Evaporation is a physical vapor deposition (PVD) technique that evaporates the material through heating, then forms a thin film on a cooled substrate. The use of the evaporation source 20 can provide various benefits in terms of lubricity, optical properties, and electrical performance.

[0078] like Figure 3 As shown, in one embodiment, the first inclination angle is set to 60° to 75°. The second inclination angle is set to 30° to 45°. Specifically in this embodiment, the first inclination angle can be set to 60°, 65°, 70°, or 75°. The second inclination angle can be set to 30°, 35°, 40°, or 45°.

[0079] refer to Figure 6 From the perspective shown, optionally, the evaporation angle of the evaporation source 20 is smaller than the inclination angle of the inner wall of the first trough section 321 (i.e., the first inclination angle), resulting in the left side of the first trough section 321 being blocked, and the evaporation source 20 cannot evaporate the organic material to the left side of the first trough section 321, that is, the functional layer 400 cannot be formed on the left side of the first trough section 321, and the functional layer 400 is discontinuous at the first trough section 321, thereby achieving a disconnection effect.

[0080] The evaporation angle of the evaporation source 20 can be adjusted by an angle limiting plate, a crucible tilt, a nozzle tilt or other methods.

[0081] The cross section of the first groove section 321 perpendicular to its own axis can be set to be in the shape of an inverted trapezoid or a U. The cross section of the pixel opening 310 can be set to be in the shape of an inverted trapezoid.

[0082] It should be noted that in evaporation or vapor deposition processes, cathode source 30 generally refers to the material or equipment used at the cathode position, primarily for depositing electrodes or other thin films. The selection and application of cathode source 30 is of great significance in the manufacture of many advanced materials, particularly in the production of electronic and optoelectronic devices.

[0083] like Figure 7 As shown, optionally, during the evaporation of the second electrode layer 600, the evaporation angle of the cathode source 30 is small, and the substrate 100 is rotated, so that the second electrode layer 600 can be continuously formed in the second groove section 322, thereby achieving a continuous second electrode layer 600. In this way, by adjusting or designing the evaporation process of the second electrode layer 600, the continuity of the second electrode layer 600 in the first groove section 321 is ensured, thereby improving the yield of the display panel 10.

[0084] In one embodiment, a display device is provided, including the display panel 10 in any of the above embodiments. Thus, the display device includes the display panel 10 and has all the technical effects corresponding to the display panel 10, which will not be described in detail here.

[0085] like Figure 8 As shown, in one embodiment, a preparation method is further provided for manufacturing the display panel 10 in any of the above embodiments. The preparation method of the display panel 10 includes at least the following steps:

[0086] S100 , forming a first electrode layer 200 and a pixel defining layer 300 in sequence on one side of a substrate 100 .

[0087] Specifically in this embodiment, the first electrode layer 200 and the pixel defining layer 300 are formed on one side of the substrate 100 by evaporation, and the first electrode layer 200 and the pixel defining layer 300 are patterned.

[0088] S200 , forming an isolation trench 320 on a side of the pixel defining layer 300 away from the substrate 100 ; wherein the isolation trench 320 includes a first trench section 321 and a second trench section 322 .

[0089] Specifically in this embodiment, each pixel opening 310 and each isolation trench 320 may be formed on a side of the pixel defining layer 300 away from the substrate 100 by using a half tone mask method.

[0090] S300: forming a partition structure 700 at the second groove section 322. Thus, the provision of the partition structure 700 can ensure that the functional layer 400 and the second electrode layer 600 are both disconnected at the second groove section 322, thereby improving the reliability of the manufacturing method.

[0091] It should be noted that the partition structure 700 can be a component independently provided on the functional layer 400 , or can be a part of the functional layer 400 .

[0092] S400, forming a functional layer 400 on the pixel defining layer 300 and the first electrode layer 200 by evaporation; when the functional layer 400 is evaporated at the first groove section 321, the evaporation angle of the evaporation source 20 is smaller than the first inclination angle and larger than the second inclination angle, so that the functional layer 400 is disconnected at the first groove section 321, and when the functional layer 400 is evaporated at the second groove section 322, under the action of the partition structure 700, the functional layer 400 is disconnected at the second groove section 322.

[0093] S500 , forming a light emitting layer 500 on the functional layer 400 within the pixel opening 310 of the pixel defining layer 300 .

[0094] Specifically, in this embodiment, the contour of the functional layer 400 located within the pixel opening 310 matches the contour of the inner wall of the pixel opening 310. The light-emitting layer 500 is located at the bottom of the pixel opening 310, and the outer contour of the light-emitting layer 500 matches the inner contour of the functional layer 400 located within the pixel opening 310.

[0095] S600, forming a second electrode layer 600 on the functional layer 400 and the light-emitting layer 500; when the second electrode layer 600 is formed at the first groove section 321, the second electrode layer 600 is continuous at the first groove section 321, and when the second electrode layer 600 is formed at the second groove section 322, under the action of the partition structure 700, the second electrode layer 600 is disconnected at the second groove section 322.

[0096] Compared with the display panels in the prior art, the display panel 10 and the preparation method thereof in the present application have at least the following advantages: by designing the isolation groove 320 on the periphery of the light-emitting layer 500 and the evaporation angle when evaporating the functional layer 400, that is, setting the evaporation angle of the evaporation source 20 between the first tilt angle and the second tilt angle, so that the side of the first groove section 321 close to the evaporation source 20 is blocked, the functional layer 400 is disconnected at the first groove section 321, and the formation process of the second electrode layer 600 is adjusted to ensure that the second electrode layer 600 is continuous at the first groove section 321, and at the same time, a partition structure 700 is provided at the second groove section 322, so that The functional layer 400 and the second electrode layer 600 are both disconnected by the partition structure 700 at the second groove section 322, thereby achieving complete isolation of the functional layer 400 around the light-emitting layer 500. At the same time, the second electrode layer 600 is continuous on both sides of the light-emitting layer 500 along the first direction, and the second electrode layer 600 is disconnected on both sides of the light-emitting layer 500 along the second direction. In this way, the functional layer 400 between adjacent light-emitting layers 500 can be isolated, and the entire surface of the second electrode layer 600 can be ensured to be continuous and electrically conductive, thereby improving the crosstalk problem caused by lateral leakage of the functional layer 400, improving color deviation and color gamut, and thereby enhancing the display effect of the display panel 10.

[0097] like Figure 9 As shown, in one embodiment, the step of forming the partition structure 700 at the second slot section 322 includes:

[0098] S411 , forming a mask layer 40 on the pixel definition layer 300 and the first electrode layer 200 .

[0099] It should be noted that the mask layer 40 may be IGZO (Indium Gallium Zinc Oxide), IZO (Indium Zinc Oxide) etc. made by PVD (Physical Vapor Deposition), or may be SiN (Silicon Nitride) etc. made by CVD (Chemical Vapor Deposition).

[0100] The thickness of the mask layer 40 can be flexibly adjusted according to actual needs. Specifically, in this embodiment, the thickness of the mask layer 40 is 300 angstroms to 1000 angstroms. For example, the thickness of the mask layer 40 is 400 angstroms, 500 angstroms, 600 angstroms, 700 angstroms, 800 angstroms, or 900 angstroms.

[0101] S412, the mask layer 40 in the pixel opening 310, the mask layer 40 in the first groove section 321, the mask layer 40 at the end surface of the first groove section 321, and the mask layer 40 in the second groove section 322 are etched away, and the mask layer 40 at the end surface of the second groove section 322 is retained to form an eaves 710.

[0102] S413: The inner wall of the second trough section 322 is side-engraved so that the eaves 710 can disconnect the functional layer 400 when the functional layer 400 is evaporated at the second trough section 322, and disconnect the second electrode layer 600 when the second electrode layer 600 is evaporated at the second trough section 322. In this way, a deposition blind zone is formed at the junction of the eaves 710 and the inner wall of the second trough section 322. The organic material and the cathode material cannot reach the deposition blind zone after evaporation. As a result, the functional layer 400 and the second electrode layer 600 cannot be formed on the side of the eaves 710 facing the second trough section 322 and on the inner sidewall of the notch of the first trough section 321, thereby achieving the effect of disconnecting the functional layer 400 and the second electrode layer 600 at the second trough section 322.

[0103] The depth of the side engraving on the inner wall of the second groove segment 322 can be flexibly adjusted based on actual usage requirements. Specifically, in this embodiment, the side engraving can be performed on the inner wall of the second groove segment 322 using a dry etching ashing process. The depth of the side engraving on the inner wall of the second groove segment 322 is 0.2 μm to 0.8 μm. For example, the depth of the side engraving on the inner wall of the second groove segment 322 can be 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, or 0.7 μm.

[0104] like Figure 10 As shown, in one embodiment, the step of forming the partition structure 700 at the second slot section 322 includes:

[0105] S421 , forming a mask layer 40 on the pixel definition layer 300 and the first electrode layer 200 .

[0106] S422: Etch away the mask layer 40 within the second groove section 322, and further etch away the inner wall of the second groove section 322 to form a partitioning groove 720 on the inner wall of the second groove section 322. Thus, when etching the partitioning groove 720, the mask layer 40 is attached to the pixel defining layer 300 to protect the pixel defining layer 300, thereby ensuring that the pixel defining layer 300 at the first groove section 321 is not etched away, thereby ensuring that the shape and size of the first groove section 321 are accurate, thereby improving the reliability of the display panel 10.

[0107] It should be noted that the first groove segment 321 and the second groove segment 322 can be etched and formed at the same time, or can be etched and formed one after another.

[0108] In other embodiments, when etching the isolation trench 320, only the first trench segment 321 is etched, and the second trench segment 322 is not etched temporarily. When etching the isolation trench 720, the mask layer 40 at the location of the second trench segment 322 is first etched away, and the mask layer 40 at other locations is not etched temporarily. Then, the second trench segment 322 and the isolation trench 720 are etched at the location of the second trench segment 322 (i.e., the second trench segment 322 and the isolation trench 720 are different locations of the same etched groove).

[0109] S423 , completely etching away the mask layer 40 on the pixel definition layer 300 and the first electrode layer 200 .

[0110] like Figure 7 As shown, in one embodiment, when forming the second electrode layer 600 at the first slot section 321, the second electrode layer 600 at the first slot section 321 comprises:

[0111] When forming the second electrode layer 600 in the first groove section 321, the cathode source 30 has an evaporation angle of 20° to 30°, and the substrate 100 is controlled to rotate so that the second electrode layer 600 is continuous in the first groove section 321. In this way, by adjusting or designing the evaporation process of the functional layer 400 and the second electrode layer 600, the functional layer 400 is ensured to be disconnected in the first groove section 321, while the second electrode layer 600 is continuous in the first groove section 321, thereby improving the reliability of the preparation method.

[0112] The evaporation angle of the cathode source 30 can be flexibly adjusted according to actual needs. For example, the evaporation angle of the cathode source 30 can be set to 22°, 25°, or 28°.

[0113] It should be noted that the display panel 10 in this application can be applied to electronic display products such as perforated screen mobile phones, notch screen mobile phones, and car screens.

[0114] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0115] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0116] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0117] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0118] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0119] It should also be understood that when explaining the connection relationship or positional relationship of elements, even if not explicitly described, the connection relationship and positional relationship should be interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately," "approximately," or "substantially" can mean within one or more standard deviations, which is not limited here.

[0120] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; a first electrode layer, disposed on one side of the substrate; a pixel defining layer, disposed on a side of the first electrode layer away from the substrate and defining a plurality of pixel openings, wherein a plurality of isolation trenches are provided on the side of the pixel defining layer away from the substrate, and the isolation trenches are disposed around the periphery of the pixel openings; a functional layer, disposed on the pixel definition layer and the first electrode layer; a light-emitting layer, located in the pixel opening and disposed on a side of the functional layer away from the substrate; a second electrode layer, disposed on a side of the functional layer and the light-emitting layer away from the substrate; In which, the isolation groove includes a first groove section arranged opposite to each other along a first direction and a second groove section arranged opposite to each other along a second direction, the inclination angle of the inner side wall of the first groove section is set to a first inclination angle, and the inclination angle of the inner side wall of the pixel opening is a second inclination angle, the first inclination angle is greater than the evaporation angle of the evaporation source, and the second inclination angle is less than the evaporation angle of the evaporation source, so that the functional layer is disconnected at the first groove section; the second electrode layer is continuous at the first groove section; a partition structure for separating the functional layer and the second electrode layer is provided on the end face and / or inner wall of the second groove section; the second direction is set at an angle to the first direction.

2. The display panel according to claim 1, wherein: The functional layer is disconnected at the first trench segment and the second trench segment, and the second electrode layer is continuous at the first trench segment and disconnected at the second trench segment.

3. The display panel according to claim 1, wherein: The partition structure includes eaves, and each second trough section is provided with two eaves spaced apart along the width direction of the second trough section. The sides of the two eaves facing away from each other are provided on the end face of the second trough section, and the sides of the two eaves facing close to each other extend from both sides of the second trough section to the top of the second trough section, so as to disconnect the functional layer when the functional layer is evaporated at the second trough section, and disconnect the second electrode layer when the second electrode layer is evaporated at the second trough section.

4. The display panel according to claim 1, wherein: The partition structure includes a partition groove, which is arranged on the inner wall of the second groove section to disconnect the functional layer when the functional layer is evaporated at the second groove section, and to disconnect the second electrode layer when the second electrode layer is evaporated at the second groove section.

5. The display panel according to claim 1, wherein: The first inclination angle is set to 60° to 75°; the second inclination angle is set to 30° to 45°.

6. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 5.

7. A method for preparing a display panel, characterized in that: include: forming a first electrode layer and a pixel defining layer in sequence on one side of the substrate; An isolation trench is formed on a side of the pixel defining layer away from the substrate; wherein the isolation trench includes a first trench section and a second trench section; forming a partition structure at the second groove section; forming a functional layer on the pixel defining layer and the first electrode layer by evaporation, wherein when the functional layer is evaporated at the first groove section, the evaporation angle of the evaporation source is smaller than the first inclination angle and larger than the second inclination angle, so that the functional layer is disconnected at the first groove section; and when the functional layer is evaporated at the second groove section, the functional layer is disconnected at the second groove section under the action of the partition structure; forming a light-emitting layer on the functional layer within the pixel opening of the pixel defining layer; forming a second electrode layer on the functional layer and the light-emitting layer, wherein when the second electrode layer is formed at the first groove section, the second electrode layer is continuous at the first groove section, and when the second electrode layer is formed at the second groove section, the second electrode layer is disconnected at the second groove section due to the action of the partition structure; The first inclination angle is the inclination angle of the inner side wall of the first groove segment, and the second inclination angle is the inclination angle of the inner side wall of the pixel opening.

8. The method for manufacturing a display panel according to claim 7, wherein: The step of forming a partition structure at the second groove section includes: forming a mask layer on the pixel defining layer and the first electrode layer; Etching away the mask layer in the pixel opening, the mask layer in the first groove segment, the mask layer at the end surface of the first groove segment, and the mask layer in the second groove segment, and retaining the mask layer at the end surface of the second groove segment to form an eaves; Carving a side on the inner wall of the second groove section so that the eaves can disconnect the functional layer when the functional layer is evaporated at the second groove section, and disconnect the second electrode layer when the second electrode layer is evaporated at the second groove section; The depth of the side engraving on the inner wall of the second groove segment is 0.2 μm to 0.8 μm.

9. The method for manufacturing a display panel according to claim 7, wherein: The step of forming a partition structure at the second groove section includes: forming a mask layer on the pixel defining layer and the first electrode layer; etching away the mask layer in the second groove segment, and further etching the inner wall of the second groove segment to form a partition groove on the inner wall of the second groove segment; etching away all of the mask layer on the pixel definition layer and the first electrode layer; Wherein, the thickness of the mask layer is 300 angstroms to 1000 angstroms.

10. The method for manufacturing a display panel according to any one of claims 7 to 9, wherein: When forming the second electrode layer at the first groove section, the second electrode layer at the first groove section is formed in a continuous step, including: When forming the second electrode layer at the first groove section, the evaporation angle of the cathode source is 20° to 30°, and the substrate is controlled to rotate so that the second electrode layer is continuous at the first groove section.

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